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https://www.readbyqxmd.com/read/30098310/introduction-to-neurogenetics
#1
REVIEW
Angeliki Vgontzas, William Renthal
Genetic variation can directly cause or increase susceptibility to neurological diseases. An explosion of new genetic technologies has enabled the characterization of specific genes responsible for many neurological diseases and has provided fundamentally new insight into their pathophysiology. These advancements, along with recent breakthroughs in gene therapy, are beginning to result in the translation of an individual's genetic sequence into targeted treatment strategies. This review aims to introduce key genetic concepts and to illustrate how these principles apply in cases of rare, single-gene neurological diseases as well as more common, polygenic diseases that are encountered frequently in clinical practice...
August 8, 2018: American Journal of Medicine
https://www.readbyqxmd.com/read/30078120/high-degree-of-genetic-heterogeneity-for-hereditary-cerebellar-ataxias-in-australia
#2
Ce Kang, Christina Liang, Kate E Ahmad, Yufan Gu, Sue-Faye Siow, James G Colebatch, Scott Whyte, Karl Ng, Philip D Cremer, Alastair J Corbett, Ryan L Davis, Tony Roscioli, Mark J Cowley, Jin-Sung Park, Carolyn M Sue, Kishore R Kumar
Genetic testing strategies such as next-generation sequencing (NGS) panels and whole genome sequencing (WGS) can be applied to the hereditary cerebellar ataxias (HCAs), but their exact role in the diagnostic pathway is unclear. We aim to determine the yield from genetic testing strategies and the genetic and phenotypic spectrum of HCA in Australia by analysing real-world data. We performed a retrospective review on 87 HCA cases referred to the Neurogenetics Clinic at the Royal North Shore Hospital, Sydney, Australia...
August 4, 2018: Cerebellum
https://www.readbyqxmd.com/read/30072945/editorial-ocular-motor-and-vestibular-deficits-in-neurometabolic-neurogenetic-and-neurodegenerative-diseases
#3
EDITORIAL
Alessandra Rufa, Aasef G Shaikh
No abstract text is available yet for this article.
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29969469/near-infrared-spectroscopy-with-a-vascular-occlusion-test-as-a-biomarker-in-children-with-mitochondrial-and-other-neuro-genetic-disorders
#4
Sainath Raman, Latifa Chentouf, Catherine DeVile, Mark J Peters, Shamima Rahman
BACKGROUND: Mitochondrial and neurogenetic diseases can present diagnostic challenges. We investigated if near infrared spectroscopy with the vascular occlusion test is able to differentiate between children with mitochondrial disease and children with neurogenetic disease or healthy controls. METHODS: Prospective observational study conducted in a tertiary children's hospital. RESULTS: Forty-three children with mitochondrial disease (including both genetically confirmed primary mitochondrial disease and cases with biochemical evidence of mitochondrial dysfunction), 19 children with non-mitochondrial neurogenetic disease and 13 healthy controls were recruited...
2018: PloS One
https://www.readbyqxmd.com/read/29961518/mcardle-disease-presenting-with-muscle-pain-in-a-teenage-girl-the-role-of-whole-exome-sequencing-in-neurogenetic-disorders
#5
William D Walters, Adolfo D Garnica, Gerald Bradley Schaefer
We present the case of a young woman with worsening attacks of muscle pain and rhabdomyolysis beginning at age 14. Initial metabolic testing and electromyography revealed findings of a nonspecific myopathy. Diagnostic options were discussed among the members of a neurogenetics clinic team. Whole-exome sequencing was selected as a first tier test. This testing revealed a known disease causing mutation in the PYGM gene consistent with McArdle disease. We discuss the decision to use whole-exome sequencing in diagnostics and the rationale for making this our choice as a first-level test modality...
July 2018: Seminars in Pediatric Neurology
https://www.readbyqxmd.com/read/29920348/main-inherited-neurodegenerative-cerebellar-ataxias-how-to-recognize-them-using-magnetic-resonance-imaging
#6
REVIEW
D Heidelberg, S Ronsin, F Bonneville, S Hannoun, C Tilikete, F Cotton
Ataxia is a neurodegenerative disease resulting from brainstem, cerebellar, and/or spinocerebellar tracts impairments. Symptoms onset could vary widely from childhood to late-adulthood. Autosomal cerebellar ataxias are considered as one of the most complex group in neurogenetics. In addition to their genetic heterogeneity, there is an important phenotypic variability in the expression of cerebellar impairment, complicating the genetic mutation research. A pattern recognition approach using brain MRI measures of atrophy, hyperintensities and iron-induced hypointensity of the dentate nuclei, could be therefore helpful in guiding genetic research...
June 18, 2018: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/29901742/transcriptomic-rnaseq-drug-screen-in-cerebrocortical-cultures-towards-novel-neurogenetic-disease-therapies
#7
Jeremiah Hadwen, Sarah Schock, Alan Mears, Robert Yang, Philippe Charron, Liying Zhang, Hualin S Xi, Alex MacKenzie
Rare monogenic diseases affect millions worldwide; although over 4,500 rare disease genotypes are known, disease-modifying drugs are available for only 5% of them. The sheer number of these conditions combined with their rarity precludes traditional costly drug discovery programs. An economically viable alternative is to repurpose established drugs for rare diseases. Many genetic diseases result from increased or decreased protein activity and identification of clinically approved drugs which moderate this pathogenic dosage holds therapeutic potential...
June 13, 2018: Human Molecular Genetics
https://www.readbyqxmd.com/read/29801916/leukodystrophy-with-disorders-of-sex-development-due-to-wt1-mutations
#8
Paulo Victor Sgobbi Souza, Bruno Mattos Lombardi Badia, Luiz Henrique Libardi Silva, Carlos Alberto Castro Teixeira, Daniel Delgado Seneor, Vitor Dias Gomes Barrios Marin, Igor Braga Farias, Renan Braido Dias, Acary Souza Bulle Oliveira, Wladimir Bocca Vieira Rezende Pinto
BACKGROUND: Hypomyelinating leukodystrophies represent an expanding group of neurogenetic disorders characterized primarily by central nervous system hypomyelination and variable neurological and non-neurological involvement. Hypomyelinating disorders have been rarely associated with gonadal dysfunction, being mainly represented by hypogonadotrophic hypogonadism in 4H syndrome. WT1 gene-associated disorders are classically associated with complex phenotypes including early carcinogenic risk for gonadoblastoma and Wilms' tumor, chronic renal failure, nephrotic syndrome and sex developmental disorders in intersex disorders and ambiguous genitalia...
July 15, 2018: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29735722/mtdna-heteroplasmy-level-and-copy-number-indicate-disease-burden-in-m-3243a-g-mitochondrial-disease
#9
John P Grady, Sarah J Pickett, Yi Shiau Ng, Charlotte L Alston, Emma L Blakely, Steven A Hardy, Catherine L Feeney, Alexandra A Bright, Andrew M Schaefer, Gráinne S Gorman, Richard Jq McNally, Robert W Taylor, Doug M Turnbull, Robert McFarland
Mitochondrial disease associated with the pathogenic m.3243A>G variant is a common, clinically heterogeneous, neurogenetic disorder. Using multiple linear regression and linear mixed modelling, we evaluated which commonly assayed tissue (blood N  = 231, urine N  = 235, skeletal muscle N  = 77) represents the m.3243A>G mutation load and mitochondrial DNA (mtDNA) copy number most strongly associated with disease burden and progression. m.3243A>G levels are correlated in blood, muscle and urine ( R 2  = 0...
June 2018: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/29721970/further-characterization-of-the-predominant-inner-retinal-degeneration-of-aging-cln3-%C3%AE-ex7-8-knock-in-mice
#10
Cornelia Volz, Myriam Mirza, Thomas Langmann, Herbert Jägle
Neuronal ceroid lipofuscinosis (NCL) is the most common group of neurogenetic storage diseases typically beginning in childhood. The juvenile form (JNCL), also known as Batten disease, is the most common form. Vision-related problems are often an early sign, appearing prior to motor and mental deficits. We have previously investigated disease progression with age in the Cln3 Δex7/8 KI mouse model for JNCL and showed a decline of visual acuity and a predominant decline of the inner retinal function in mice, similar to human disease...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29713304/uncovering-true-cellular-phenotypes-using-induced-pluripotent-stem-cell-derived-neurons-to-study-early-insults-in-neurodevelopmental-disorders
#11
REVIEW
James J Fink, Eric S Levine
Animal models of neurodevelopmental disorders have provided invaluable insights into the molecular-, cellular-, and circuit-level defects associated with a plethora of genetic disruptions. In many cases, these deficits have been linked to changes in disease-relevant behaviors, but very few of these findings have been translated to treatments for human disease. This may be due to significant species differences and the difficulty in modeling disorders that involve deletion or duplication of multiple genes. The identification of primary underlying pathophysiology in these models is confounded by the accumulation of secondary disease phenotypes in the mature nervous system, as well as potential compensatory mechanisms...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29709585/emerging-role-of-viral-vectors-for-circuit-specific-gene-interrogation-and-manipulation-in-rodent-brain
#12
REVIEW
Erika Sarno, Alfred J Robison
Over the past half century, novel tools have allowed the characterization of myriad molecular underpinnings of neural phenomena including synaptic function, neurogenesis and neurodegeneration, membrane excitability, and neurogenetics/epigenetics. More recently, transgenic mice have made possible cell type-specific explorations of these phenomena and have provided critical models of many neurological and psychiatric diseases. However, it has become clear that many critical areas of study require tools allowing the study and manipulation of individual neural circuits within the brain, and viral vectors have come to the forefront in driving these circuit-specific studies...
April 27, 2018: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/29644913/possible-modifier-genes-in-the-variation-of-neurofibromatosis-type-1-clinical-phenotypes
#13
Parisa Sharafi, Sükriye Ayter
Neurofibromatosis type 1 (NF1) is the most common neurogenetic disorder worldwide, caused by mutations in the (NF1) gene. Although NF1 is a single-gene disorder with autosomal-dominant inheritance, its clinical expression is highly variable and unpredictable. NF1 patients have the highest known mutation rate among all human disorders, with no clear genotype-phenotype correlations. Therefore, variations in NF1 mutations may not correlate with the variations in clinical phenotype. Indeed, for the same mutation, some NF1 patients may develop severe clinical symptoms whereas others will develop a mild phenotype...
March 2018: Journal of Neurogenetics
https://www.readbyqxmd.com/read/29618358/clinical-and-molecular-characterization-of-112-single-center-patients-with-neurofibromatosis-type-1
#14
Giovanni Corsello, Vincenzo Antona, Gregorio Serra, Federico Zara, Clara Giambrone, Luca Lagalla, Maria Piccione, Ettore Piro
BACKGROUND: The aim of this retrospective study was to define clinical and molecular characteristics of a large sample of neurofibromatosis type 1 (NF1) patients, as well as to evaluate mutational spectrum and genotype-phenotype correlation. NF1 is a relatively common neurogenetic disorder (1:2500-1:3000 individuals). It is caused by mutations of the NF1 gene on chromosome 17ql1.2, with autosomal dominant pattern of inheritance and wide phenotypical variability. Café-au-lait spots (CALs), cutaneous and/or subcutaneous neurofibromas (CNFs/SCNFs), skinfold freckling, skeletal abnormalities, Lisch nodules of the iris and increased risk of learning and intellectual disabilities, as well as tumors of the nervous system and other organs are its main clinical features...
April 4, 2018: Italian Journal of Pediatrics
https://www.readbyqxmd.com/read/29589152/genetic-test-utilization-and-diagnostic-yield-in-adult-patients-with-neurological-disorders
#15
Tanya M Bardakjian, Ingo Helbig, Colin Quinn, Lauren B Elman, Leo F McCluskey, Steven S Scherer, Pedro Gonzalez-Alegre
To determine the diagnostic yield of different genetic test modalities in adult patients with neurological disorders, we evaluated all adult patients seen for genetic diagnostic evaluation in the outpatient neurology practice at the University of Pennsylvania between January 2016 and April 2017 as part of the newly created Penn Neurogenetics Program. Subjects were identified through our electronic medical system as those evaluated by the Program's single clinical genetic counselor in that period. A total of 377 patients were evaluated by the Penn Neurogenetics Program in different settings and genetic testing recommended...
May 2018: Neurogenetics
https://www.readbyqxmd.com/read/29478609/neurogenetics-of-pelizaeus-merzbacher-disease
#16
M Joana Osório, Steven A Goldman
Pelizaeus-Merzbacher disease (PMD) is an X-linked disorder caused by mutations in the PLP1 gene, which encodes the proteolipid protein of myelinating oligodendroglia. PMD exhibits phenotypic variability that reflects its considerable genotypic heterogeneity, but all forms of the disease result in central hypomyelination associated with early neurologic dysfunction, progressive deterioration, and ultimately death. PMD has been classified into three major subtypes, according to the age of presentation: connatal PMD, classic PMD, and transitional PMD, combining features of both connatal and classic forms...
2018: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/29449815/combinatorial-codes-and-labeled-lines-how-insects-use-olfactory-cues-to-find-and-judge-food-mates-and-oviposition-sites-in-complex-environments
#17
REVIEW
Alexander Haverkamp, Bill S Hansson, Markus Knaden
Insects, including those which provide vital ecosystems services as well as those which are devastating pests or disease vectors, locate their resources mainly based on olfaction. Understanding insect olfaction not only from a neurobiological but also from an ecological perspective is therefore crucial to balance insect control and conservation. However, among all sensory stimuli olfaction is particularly hard to grasp. Our chemical environment is made up of thousands of different compounds, which might again be detected by our nose in multiple ways...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29432235/genetic-diagnostics-for-neurologists
#18
Laura Silveira-Moriyama, Alex R Paciorkowski
PURPOSE OF REVIEW: This article puts advances in the field of neurogenetics into context and provides a quick review of the broad concepts necessary for current practice in neurology. RECENT FINDINGS: The exponential growth of genetic testing is due to its increased speed and decreasing cost, and it is now a routine part of the clinical care for a number of neurologic patients. In addition, phenotypic pleiotropy (mutations in the same gene causing very disparate phenotypes) and genetic heterogeneity (the same clinical phenotype resulting from mutations in different genes) are now known to exist in a number of conditions, adding an additional layer of complexity for genetic testing in these disorders...
February 2018: Continuum: Lifelong Learning in Neurology
https://www.readbyqxmd.com/read/29410950/-tsen54-gene-related-pontocerebellar-hypoplasia-type-2-could-mimic-dyskinetic-cerebral-palsy-with-severe-psychomotor-retardation
#19
Iliyana Hristova Pacheva, Tihomir Todorov, Ivan Ivanov, Desislava Tartova, Katerina Gaberova, Albena Todorova, Diana Dimitrova
Pontocerebellar hypoplasia (PCH) type 2 is a very rare autosomal recessive neurodegenerative disorder with prenatal onset that disrupts brain development. We present three patients (two siblings and one unrelated child) with PCH 2 linked to the most common mutation c.919G > T (p.Ala307Ser) in TSEN54 gene. The disease started soon after birth with feeding difficulties, extrapyramidal symptoms, psychomotor retardation, progressive microcephaly. Two of the patients were diagnosed with dyskinetic cerebral palsy (CP) at first...
2018: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/29406573/phenotypic-characterization-of-kctd3-related-developmental-epileptic-encephalopathy
#20
E A Faqeih, M Almannai, M M Saleh, A H AlWadei, M M Samman, F S Alkuraya
The association between KCTD3 gene and neurogenetic disorders has only been published recently. In this report, we describe the clinical phenotype associated with 2 pathogenic variants in KCTD3 gene. Seven individuals (including one set of monozygotic twin) from 4 consanguineous families presented with developmental epileptic encephalopathy, global developmental delay, central hypotonia, progressive peripheral hypertonia, and variable dysmorphic facial features. Posterior fossa abnormalities (ranging from Dandy-Walker malformation to isolated hypoplasia of the cerebellar vermis) were consistently observed in addition to other variable neuroradiological abnormalities such as hydrocephalus and abnormal brain myelination...
May 2018: Clinical Genetics
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